Maverick 1.0 Released

[Steve Maughan]

I've just released Maverick 1.0. This is a new version, and the first one to play active and IMO really quite attractive tactical chess. For those of you who actually play against chess engines I'd be interested in your feedback.

Main changes:
+ Added Late Move Reduction
+ Added more endgame knowledge
+ Added binaries for Android ARM7 and Linux 32 (Thanks to Jim Ablett)
+ Added refutation moves to the move ordering
+ Added beta pruning (inspired by Senpai)

The strength is approximately 2500 ELO on the CCRL scale. You can download it from here:

http://www.chessprogramming.net/downloads/

As an example of Maverick's play, here's a nice game against Jellyfish:

[pgn][Event "?"]
[Site "?"]
[Date "2015.04.20"]
[Round "1"]
[White "Maverick 1.0"]
[Black "Jellyfish 1.0"]
[Result "1-0"]

1. d4 {book} c6 {book} 2. e4 {book} d5 {book} 3. Nc3 {book}
dxe4 {book} 4. Nxe4 {book} Nf6 {book} 5. Nxf6+ {book} exf6
{book} 6. c3 {book} Bd6 {book} 7. Bd3 {book} O-O {book}
8. Ne2 {book} Re8 {book} 9. Qc2 {book} g6 {book} 10. h4
{book} Nd7 {book} 11. h5 {book} Nf8 {book} 12. Bh6 {book}
Be6 {book} 13. O-O-O {book} Qa5 {book} 14. a3 {+0.72/12
1.2s The first move out of book. Maverick like the position and
sees the potential for a kingside attacked} Bd5 {-0.08/13
2.4s} 15. f3 {+1.01/13 1.4s} b5 {-0.11/14 2.3s} 16. Nf4
{+1.15/13 1.4s} Ba2 {-0.10/13 1.5s a pointless move by
Jellyfish} 17. Rd2 {+1.00/11 2.8s} f5 {-0.03/12 1.6s}
18. g4 {+1.00/13 1.4s Maverick knows it should push the
pawns to create opportunities for an attack} Qc7 {+0.12/13
1.3s} 19. Nh3 {+1.01/12 1.3s} fxg4 {+0.20/13 1.3s} 20. fxg4
{+0.96/13 1.9s} Bd5 {+0.17/14 2.3s} 21. Rf1 {+1.42/12 1.7s}
Ne6 $2 {+0.17/12 2.4s a mistake. The knight was guarding
g6, which is under pressure} 22. hxg6 {+2.58/14 0.99s} hxg6
{-0.90/15 1.6s} 23. Bxg6 $1 {+3.33/14 1.7s The breakthrough}
Re7 {-0.91/14 2.2s} (23... fxg6 24. Qxg6+ Kh8 25. Rf7
{winning}) 24. Bh7+ {+4.51/13 1.0s} Kh8 {-0.91/13 0.26s}
25. Qf5 {+4.99/15 2.1s} f6 {-2.52/13 1.4s} 26. Bg6
{+5.06/14 1.7s} Bc4 {-2.77/13 1.7s} 27. Qxf6+ {+6.08/10
0.95s} Kg8 {-2.84/13 1.8s} 28. Rff2 {+6.37/11 1.5s} Rd7
{-3.53/12 1.8s} 29. Ng5 {+6.77/10 1.0s} Nxg5 {-4.17/14
1.1s} 30. Qxg5 {+8.12/12 0.95s} Kh8 {-4.36/15 1.3s}
31. Qf6+ {+11.61/11 0.68s} Kg8 {-4.36/14 1.6s} 32. Rf5
{+12.15/13 0.90s} Rg7 {-10.54/13 0.84s} 33. Bxg7 {+13.80/12
0.91s} Qxg7 {-11.67/15 0.86s} 34. Qxd6 {+13.95/12 0.62s}
Rf8 {-11.67/13 1.4s} 35. Rh2 {+M13/11 1.4s} Ra8 {-21.48/13
1.4s} 36. Rh7 {+M9/9 0.14s} Qxh7 {-M16/8 0.002s} 37. Bxh7+
{+M7/7 0.016s} Kxh7 {-M12/6 0.002s} 38. Rg5 {+M5/5 0.002s}
Bf7 {-M8/4 0.001s} 39. Qh2+ {+M3/3 0.001s} Bh5 {-M4/2
0.001s} 40. Qxh5# {0.00/1 0.001s, White mates} 1-0[/pgn]

And here another game against AnMon, where Maverick's aggression pays off!

[pgn][Event "?"]
[Site "?"]
[Date "2015.04.20"]
[Round "1"]
[White "AnMon 5.75"]
[Black "Maverick 1.0"]
[Result "0-1"]

1. e4 {book} c6 {book} 2. Nf3 {book} d5 {book} 3. Nc3
{book} Bg4 {book} 4. h3 {book} Bxf3 {book} 5. Qxf3 {book}
Nf6 {book} 6. d3 {book} e6 {book} 7. Bd2 {book} Bb4 {book}
8. e5 {book} Nfd7 {book} 9. Qg4 {book} Bf8 {book} 10. f4
{book} g6 {book} 11. h4 {book} h5 {-0.46/14 1.6s} 12. Qh3
{book} c5 {-0.34/15 1.4s} 13. O-O-O {book} Be7 {-0.30/16
4.7s} 14. Kb1 {+0.51/12 3.4s} Nc6 {-0.05/16 1.6s} 15. g3
{+0.53/11 1.3s} Nd4 {-0.14/15 1.1s} 16. Bg2 {+0.46/11 1.4s}
Nb8 {0.00/15 1.4s} 17. Rde1 {+0.55/12 2.3s} Nbc6 {+0.11/15
2.4s} 18. Nd1 {+0.49/11 1.6s} Qb6 {+0.16/12 0.93s} 19. Ne3
{+0.45/11 1.7s} Qa6 {+0.46/13 2.0s} 20. a3 {+0.47/9 0.69s}
b5 {+1.57/13 1.0s} 21. Bc3 {-0.33/11 4.3s} b4 {+2.09/15
0.98s} 22. axb4 {-0.73/11 1.1s} cxb4 {+2.82/15 1.3s}
23. Bxd4 {-1.19/12 3.0s} Nxd4 {+2.74/14 2.0s} 24. Bf1
{-1.20/11 2.2s} Rc8 {+3.30/13 0.75s} 25. Qg2 {-1.17/10
0.72s} b3 {+3.37/13 0.99s} 26. cxb3 {-1.80/12 3.4s} Qa5
{+4.11/14 0.81s} 27. Rd1 {-2.08/11 0.85s} O-O {+5.06/14
1.00s} 28. Nc4 {-2.75/10 0.60s} dxc4 {+5.62/15 3.7s}
29. bxc4 {-3.55/11 2.1s} Qa4 {+5.71/14 1.0s} 30. Qd2
{-10.32/9 2.7s} Rc6 {+11.00/12 0.90s} 31. Qc3 {-15.63/9
2.5s} Bb4 {+16.78/13 0.91s} 32. Rc1 {-19.38/10 2.2s} Bxc3
{+M19/13 0.90s} 33. Rxc3 {-M23/9 0.92s} Rb8 {+M17/12 0.77s}
34. Rh2 {-M19/6 0.14s} Rcb6 {+M13/11 0.65s} 35. f5
{-23.37/8 1.9s} Ne2 {+M9/9 0.11s} 36. Rxe2 {-M9/6 1.1s}
Qd1+ {+M7/7 0.005s} 37. Ka2 {-M7/4 0.002s} Ra6+ {+M5/5
0.002s} 38. Ra3 {-M5/3 0.002s} Rxa3+ {+M3/3 0.002s}
39. Kxa3 {-M3/3 0s} Qa1# {0.00/1 0.002s, Black mates} 0-1[/pgn]

Special thanks to Graham Banks and Ray Banks for testing, to Jim Ablett for the ARM and Linux versions and to Dann Corbit for general tips and clean-up.

- Steve

[fern]

Thanks Steve...I will play it in Shreder GUi this afternoon.
40 moves an hour, my usual rhythm...

Fern

[cdani]

Thanks!

[JVMerlino]

Congratulations! I knew that once you added LMR and some pruning you'd get a big bump.

[Graham Banks]

I've just released Maverick 1.0. This is a new version, and the first one to play active and IMO really quite attractive tactical chess.........

Thanks Steve. I've already seen a few examples of this attractive chess. Nice!

[Steve Maughan]

Thanks Fern, Daniel, John and Graham - enjoy!

- Steve

[gerold]

Thanks Steve. Nice.

Best,
Gerold.

[carldaman]

Thanks, Steve! Nice style, too.

Regards,
CL

[chetday]

Steve, thanks very much. I just installed the latest version of Maverick and will give it a go this evening.

[Steve Maughan]

Hi Fern,

How was Maverick to play against?

Steve

Thanks Steve...I will play it in Shreder GUi this afternoon.
40 moves an hour, my usual rhythm...

Fern